[jboss-user] [Messaging, JMS & JBossMQ] - Re: Message Cache configuration problem

[adrian@jboss.org]

I don't think you understand how the MessageCache works.
It plays no part in storing Persistence Messages.

What it does do is to discard messages from memory (when memory is tight)
that it is sure are in persistence storage and reload them when they are needed.

That means it needs to store messages that are NOT persistent to move them
out of memory. These have "TXOP=T" in the database. T meaning temporary.

The number of Hard references are the number of working messages in memory
(nothing to do with those that are persisted).
i.e. It is the ones that are currently (or recently) being sent and received.

If they are persistent, they will remain in the database until some client acknowledges
receipt of the message.

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